docs/functions.rst
docs/installation.rst
    Updated Tesseract information.

src/__init__.py:
    Removed global TESSDATA_PREFIX as not required any more.
    Pixmap.pdfocr_save()
    pdfocr_tobytes()
        Use get_tessdata() to infer tessdata if unspecified.
    get_tessdata():
        Added optional `tessdata` arg; is returned directly if set.
        Raise exceptions if we cannot find tesseract data (used to return
        False.)

src/utils.py:
    Removed global TESSDATA_PREFIX as not required any more.
    get_textpage_ocr() (and Page.get_textpage_ocr()):
        Use get_tessdata() to infer tessdata if unspecified.

…inux.

We need to add PYMUPDF_SETUP_PY_LIMITED_API to CIBW_ENVIRONMENT_PASS_LINUX.